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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42a1d0875e51e38553991af0c3d9e7a18cede85cf9ae4c5156e6e207db0fc96a' 
  AND token = '6IEj8Me03l5CvjRXCxyDOXLF77cWFvy3930cY0K5WAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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