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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '399dd6e23c6ffb70e2cf621d26afb3c5f5bf6b7793534cb6fa002db7126c594d' 
  AND token = 'l9sSqi9hZ9rIpjhY9MfpFb1gr/0P0/v+eQXt07isyEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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