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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a74e66d4ffb2305e59dcf5085c78351987bfaa8dc9b5dab13c385ef20d8e495' 
  AND token = 'SsxJnY+9gloQX7dFX45Sl+PhQG2GW4NrcJXAsommUDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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