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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '336ad0a8b87adb418819823e5b086fe42e6d6b083a4797c97fe91c4487a5d30a' 
  AND token = 'ZWgjelale2TmEpxv9n89oI8f8GGQOT3xS9AhoLNVV/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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