SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b07619f9ab34f346b93c729a43e7e4e67fec157d3e03c98b5246b976abcdac6f' 
  AND token = 'x19hdP+qIq82LNssRR/vmYVGZsTGpNmCJnGj0/gW+SI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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