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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f726912290634086b12b6fcb0da1d5a249198475b6080fb64e243500cbd8735' 
  AND token = 'HzG2cM2Zx4xbIaDPPBA5umJ/b63ZyuuCaMd3Xdgw8JU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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