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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b08b09546f8708f32ffb4b65065679b0c465ef5125182c64f719157ea75b0e6' 
  AND token = '/vfRQajUBcUCdcyWHZvbLEOD557IT8O4BjPsf3MvX5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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