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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f788a7abc30388fd431fab720fb80e1248fc980c6632226f52a78bbf8273d209' 
  AND token = 'y1xXodlcofAktLV/+NCgN/wgcUvER2ZrARaJZgvwhC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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