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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6cf8f9e12d1a7fccc8b952b131863e09624cfb00abd81fdf06f741f2434af9d' 
  AND token = 'O1dULCRrAkpWU65gY4nYgi7KJO+DM5QQ4ATSl/uPvaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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