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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8737fc24fcd5217f1f5babd7d3fc5d59f94255084cf1bea3a8abec4f6d8b7397' 
  AND token = 'mBq0FvK4oXi9FDN5m5C+r4MTnc3UbjOlxOn2VH4iFrI=' 
  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"
    }
  }
}