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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f19ca44898f2ecc69e76777c761a2dacc25542f3b6d9f7651a990d9f8174027f' 
  AND token = 'ZjTG9jgp6w+gi570GEKnN5SE6hGqnZ7VaxEpsWn8/5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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