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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '999bf4d25a4250ca97b43ef50f20d15c7e8d3babe8cb4d8d78fe7ae863286aba' 
  AND token = 'DvQHGCfGiyA8D0+yW0umNmRDmoxhmhywlKLW+T98cQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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