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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bf3cbe8aea556bc4c69875e1e4e5cb6845c6e8fbd6cda2ca60b60c69e4c6b71' 
  AND token = 'bk2KLuQ4GftzZ30eUCWsPBTajfdcDu35yXhRF0lBnJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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