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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7b0d7a8522bae0967ecfbdf02040f9eea3cef518b1e51cf73451c11b3f9cdd8' 
  AND token = 'S9WB/X2rLEPpio0MDQJpnUsdWdZmCg8JKNnZoZWTwI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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