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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e4dcc43fac6c55ca718c8337c37cba63daea6b1b7dd41f844dbb92763028c7f' 
  AND token = 'RZ4zc00bF9XaVLJ8tOcPSLUy3FeqtgsXd67rAzefH/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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