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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c2df879d0fc150a844b5f0cfd9ae70be4f72a8e62240a0b75d39ef68c552272' 
  AND token = 's+EOnBV4T6C4m1yQK6UCLIA7Yk+yTiyfPt97uyNguz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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