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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08b110b72753e5a79b6e6afe7d52de3aa8a745bb7240427f68b3b4b15dc85028' 
  AND token = '+Me9JiLOOCsw/MIADN4NnQDyqp0TqEt0mNKGEDP/zvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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