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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14973ba71664b5fc90c10132f6600cd9d28c1cf7d9f80990b169708f253e05c9' 
  AND token = 'a/r8qN5kVdbbv1dxQhenuTUkkVZIUg/my6tq2aW2QSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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