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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2eccd38c79d4d94d7494469cc71030d6a084cef8c871587e99495fea80edb7b' 
  AND token = 'gUQyy7NvIOkr6b7vvczT+dK+T6DR+ZSlJ4ObtfOtYy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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