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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '619bdec9edc7cd0d15c9244fd36adc5c87292ac81ffbb638ea9bbe36452d1dc1' 
  AND token = 'NYV62nMO8qAbm1nKz+G5GA8S+dvdMhCYDBSknxh+K5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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