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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e994520a6c135ea1322143489c9c2497ef6da75af736be31744d452e4c0f68a8' 
  AND token = 'jL9f+4Ufwo13IanPuXKBLB1HXGCK8+4R3Kc5AQTnI/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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