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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2798f2d142e94f5ae80f055b67a3735193273565ea10070f820532a5e77ee03d' 
  AND token = 'Fmu0dWn++de4V3EmdQ5sQAAGMw0L9uTQ0jE7Gs93wY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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