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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6eb536e12ff6afae38c6ed7d632531b6db3c4da5ed8ff57e30ba76c8854f5c2' 
  AND token = 'Cwwn51R1B/Iip3ra/SpHFNfgBeFA3uWPeibBlq8IN5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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