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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3afe4e220f58a6c96636c23be661da4734cedc697941cb0ed0bee3f246765246' 
  AND token = 'ztzSjlc+k3KoqD1BDi6K6wWuirwkc9DclvKeSn/6yN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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