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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4b431bec1ccba98daeb13770f09f98ca610a6acefb71c729f146e05c7c03d35' 
  AND token = 'nH+doEa8BcjwpfEkKsB3/fM0ZAZ4P2v6b9zA0QdB9VQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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