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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2a6ea3b8982cc86eb972b5c1e255e172683912c6fa11c88201fb5b6e722353c' 
  AND token = 'fCKO4jp7HAuoSVHzHTw7/x3+AlTrx9L83zDQm6a6Qxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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