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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c30cea8dc0e4e3d16935e40de34572a1db17a16d21530f4f5ff56d4176401201' 
  AND token = 'nPyVZOXFIcrUj4RRVL77gG+kj4tc0tHT9+woVx5BDwg=' 
  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"
    }
  }
}