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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f04c3961061b11a795c7f40a80a4bb5b441224ca39b9bcf051432273ce033fdd' 
  AND token = '9VOgnv4KglYWjmD01NT1K0Nc4w0owea3TPzlsRKEAKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}