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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61b4160e495dd6c2617bb5f785ce0d2c38c21e4e98c9b9b6612aef32456f5718' 
  AND token = '1bHLEzJtg6a0SrTk5kyhKwTV1Wf+tqTvN+Aqlkhs754=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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