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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e93b390592f293aa47c3a113ffdfa88144df31256fbd687cf0958a8fe3f303cc' 
  AND token = 'w2kBJdcpvX5XuDELPvvXH0LOXqhukCXI6z0FQ6wDS3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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