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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75caef8f420f3bf083acfb5bc210c7ae58c7b9f1687cfee40d62feac00bfab0e' 
  AND token = 'zb+LVig5QScSr6xaz7Ig7CLXsg9EbOT/8bY6PnbSCRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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