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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0d9b4d4801bd43c3bce9a6c35e7c091e2dbb8d6b21389200459426727590e8b' 
  AND token = 'u/ug5t75CeFnPCYPjRSD/1x/+aLJHKAQMXPavyxX5Gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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