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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2508bb12710bd2e6a253931190c9b4f94986858a791b7c1332a3e04140489a3d' 
  AND token = 'c/E7YTn2ZuapeD1KHlhgbp2t+CeFY7SAris1qVyluyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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