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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd59801e603be44bc1036a8b596502bab7e5028b30e548c857134a5f120088163' 
  AND token = 'T8NGRbihaO2NgXSVuofJ189foHer6ThZzVMkqc6qMkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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