Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b75b2981fdca4230b92ab5383f5fa2634ec9f8992f5baa04d667aa39825ae632' 
  AND token = '0w0M5r31cPcXn6SiTTtKrvvL3X3DqmjpgfG4s3LsjJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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