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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92c54bb5feab1919482430a33e3513a46b7fddb11da1d519c3c57d6451e66a36' 
  AND token = 'BdaVpMceWumuD45gB6eaAXeNfgoa0INidCcyrcTzlLU=' 
  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"
    }
  }
}