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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb2a3af08dc410b0d94ef4338b9d1deb605bb08a97bd33447382cbebb62a8df2' 
  AND token = 'FTlt/s0ZcW/us1X8dg54G1jBvtn7ME5d+SoOtL0U7/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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