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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44e5947d6d212ce386fc18e7c5e5c829cc990734aba81176c1b3c7ae4feaef5d' 
  AND token = 'ZjJi8/qTRCjZJ1aL2IrtHGvry2abUw/F2sJ5zH1Rofc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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