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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef202514084b204251e32f55c81b95785ca29180cfa62d62c8704c4b8c6f74d7' 
  AND token = 'yVCtupgxslqLl+upN252nZD8YHkFljXyeJakw0wy+BY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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