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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a71683ac119b4dddf18b73586fbead4e6f018da4f7bc892b9c4f132812a5bcbf' 
  AND token = 'dt+ATixXt6ilK8NE/9gO4mUJ5C5zA1K9sGVPnnLYjAc=' 
  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"
    }
  }
}