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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa0f5ddd8e5176fdf19ddf88e22b89749061f31f36149a9fdbde85e0bf2e09e5' 
  AND token = 'TpvEfSVDAdVp+74wiGhw6GMh3mD7zbRsTB00fCQRSD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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