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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c731faa73dafa9be8ee1f3b1144bbac78a38c187ff3b474fc1b38d7d283bb90' 
  AND token = 'JkvHp16tIA0nYIWC/5P1jgitawLg3m6aFT8wB0kH4SA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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