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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0ba9ff6e7c8b04d76b5c1f74f342583edcc23471b59402a55dcef7bc9bd650b' 
  AND token = 'VZIaT0le9Pr7ytGjuv/2qAUk5GxXPiE7U1EFZ59Y6o8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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