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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8411d421b492b92ff8828e48dc7ead64d997ec795f710bf90579aca61e1b9635' 
  AND token = 'gzQkNA4wmukVh47Sh/5rftT/kgzxnfRX++mANzPbB/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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