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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81c85918b231e0eb45f093ac9c6b300ab83f5c3d3df5649831686fab99af9f85' 
  AND token = 'YDH3/bc85q4NA28XQouetL+0Pcip3mfAt/E7rhlkRrs=' 
  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"
    }
  }
}