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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f18a877e21458fd5be25838493854f0411c2b7a87e04f0452e63af5e5062ed35' 
  AND token = 'cW19lWTMk3BDs7vwPgRZuOeSQKoHRyjG3WqCTvM4HkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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