Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fc77b921b0aa8e07613ea8d0217c4f5e2f0a0a89ebe7b6a5cc2b3e21392a580' 
  AND token = 'jx3rPR3cRP4fGpAJzJe8wHRRKePHz6rPE4wvHW8ktfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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