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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dc8789c5a1f9a69c887be988700030b1c315b5c3f306dfa86d2d51b6a065c85' 
  AND token = 'er/gQZhI6AFZjTW7EXUuRpyJ0Cp5PzgUNgQMfEtZEr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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