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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a33c61a395486d6bb469872f6eceba1af6dbd0a389764202f8647aeca19313cc' 
  AND token = 'bjuSpsYyCYUxg+pHgFwAhWfU0jKL000dxdp+foCDY6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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