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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a85fb828d304bde71b534474c9e7dfdbbe921fdf2a3e16e5078a69fb51faac1b' 
  AND token = 'p53nShhWrCm8QpBsfcP0yQePr3wBAADh9MFK/PjjKoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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