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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a19e99e80bd366082948561d9e705673d4267d19c374de746873e02d1af12d1b' 
  AND token = 'f5028MKXAdB6B0JU6R2WdTYrJnA5Me4KCgXlsljdMi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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