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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4444fd8fe49d731bd9bc46ffc3c57d097d78e73141a07dd2d8eb2b68e4fca3b1' 
  AND token = 'FiD9EvYkwIB4gdvpDApBjLy4nVJHzqe2jfoTVSE0q1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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