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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c402884b34c6b97190345f2cfc5ba5d5b8dd285653ccbc246f015ea15dce32ac' 
  AND token = 'zb7wdG6GQKC6Q6cmew0juH91MuxwSn1jyZFacm1p99Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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