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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7f1eb13e81de5c99df9884ae1bbf9e872067a16370ead4418a618504dc94ddf' 
  AND token = '5+GTv/v1pXivuAIm77KTTrW/qhZC4LtQFBDy9QRdAxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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