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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '509bd56ec89187be2ab39ddf40342b3fb20a107d6e182213f126ed8f571753fd' 
  AND token = '9yh996wa0zveaDM7If8H/B2W4U45LwC4AHu0bvwMhGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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