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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1629b1034ccaef36b731c1add18b0daaef108060900c4364b3766f62233f366b' 
  AND token = 'QYCgYsWrNwTpsp7AfFM6jKqvQzasAK7Q+dvO0HrxIQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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