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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acb1b5bbac3ff39fbb62cdf2a5c08b33bf8536436b9e31239223f42e03d6aa9e' 
  AND token = 'KLkAf8lbfD9JQqxD2jefb95wszKrHcrRl7Urf//D/UQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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