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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '439b39826c3c9efa53174bd2a33a8c204d7dd50f02c46c2f8c90befe4449861d' 
  AND token = 'zDejygWwpCph6qfsymKb7o5QMqksr5v7bMIsh0OxST0=' 
  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"
    }
  }
}