SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58591a036089b44683f7a88a783c5792702935af3ac5ff012124a1385616c21c' 
  AND token = 'vnZjLhzssRF/J9/j6V5els87UhEHNVqordkK0SipcMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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