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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac93b0dfb88dd54e774da26c310793a0010aa0cc70fc4def5d5fd26675749c5f' 
  AND token = 'sWtx5uZl8cy6tn2oBj/5Bu3oL4i/TFMhr0FyNRuVI30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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