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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '237b6630bc17ae6ffec788a5bb80eae2048b6e7161bcf8418cdf18538a6a746a' 
  AND token = '34jbkoEs+2SqnVYZKqlcKe8yPkhCcDzoR+hBZoPECJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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